<template>
  <div class="alert">
    <div class="alert-main" v-for="item in notices" :key="item.name">
      <div class="alert-content">{{ item.content }}</div>
    </div>
  </div>
</template>
<script>
  let seed = 0
  function getUuid () {
    return 'alert_' + (seed++)
  }
  export default {
    data () {
      return {
        notices: []
      }
    },
    methods: {
      add (notice) {
        const name = getUuid()
        let _notice = Object.assign({
          name: name
        }, notice)

        this.notices.push(_notice)

        // 定时移除，单位：秒
        const duration = notice.duration
        setTimeout(() => {
          this.remove(name)
        }, duration * 1000)
      },
      remove (name) {
        const notices = this.notices

        for(let i = 0; i<notices.length; i++) {
          if (notices[i].name === name) {
            this.notices.splice(i, 1)
            break
          }
        }
      }
    }
  }
</script>
<style>
.alert {
  position: fixed;
  width: 100%;
  top: 50px;
  left: 0;
  text-align: center;
  pointer-events: none;
}
.alert-main {
  display: inline-block;
  margin-bottom: 8px;
  padding: 8px 16px;
  background: #fff;
  border-radius: 3px;
  box-shadow: 0 1px 6px rgba(0, 0, 0, .2);
}
</style>